Air mixing and filtering device



4March 9 ,1925. 1,575,935

GT.RANDLE AIR MIXING AND FILTERING DEVICE Original Filed Jan. 18. 1925 Patented Mar. 9, 19262.,

GEORGE T. RANDLE, OF SAYLES'VLLE, ROE ISLAND, ASSGNOR TO THE MOTHER PROTECTIN COMPANY, QF CENTRAL FALLS, RHODEISLAND, A. CORPORATON.

AIR MIXING AND FLTERING DEVVCE.

Original application filed `aniiary 18, .1S-23, Serial No. 613,545. Patent No. 1,530,619. kDivided and this application filed March 18, 1925. Serial No. 16,548.

To @ZZ whom t may concern.:

Be it knoivn that I, Grenen T. RANDLE, a citizen of the United Sta-tes, residing at Saylesville, in the county of Providence and State ot' Rhode island, have invented certain neu7 and useful improvements in Air Mixing and Filtering Devices, of Which the following is a specification.

My invention relates to improvements in air mixing and iiltering devices of the form that is used in combination With protecting and cooling systems for electric motors and is adapted to be installed in the conduit line lor delivering air to the motor, and shown and described in 'the application that was tiled by myself January 18, 1923, Serial No. 613,545, which was issued as Patent No. 1,530,619, March 2st, 1925, and of which this is a division, and the object of my invention is to provide improved means as applied to the detailed structure of the device ivhereby the same is constructed and arranged in such form as to be simple and economical in manufacture and is convenient and etlieient under conditions ot operation.

In the accompanying drawing Figure 1 is a side elevationvof my improved air mixing and iltering device, with a part broken aivay showing part ot the damper, and other parts of the damper being shown by broken lines.

Figure 2 is a plan vieiv of the same, the screen plate being in part broken away to shoiv portions of the interior structure, particularly the locking mechanism for the damper.

Figure 3 is an end elevation of the same, as viewed from the inlet or receiving end.

My improved air mixing and filtering device is made of sheet metal and comprises a box-like body portion 10 et rectangular or substantially square form of crosssection and appreciable length that is provided at the ends with terminals 11 oit cylindrical iloriu that are adapted to make connection with the conduit structure for delivering the air to the motor on one side and `for receiving the outside air on the other side of the device.

As shown, the terminal 11 at the right is connected to the conduit that receives the outside air aud the terminal 11 at the left is connected to the conduit that delivers the air to the motor, and which may consist of a mixture or" the outside air and air trom Within theroom. Y

The body portion 10 comprises at the lett or delivery end a compartment 12 in the forni of a dust collector in Which the iiltering of the air is etlieeted and Which compartment is defined by end Walls 13 of Wire mesh `and which may be provided at the upper side With cover or door 14 that may be opened and closed by a sliding movement.

The Walls 13 are spaced apart so ras to admit therebetween the filtering structure which may be of ordinary form, such. ma-

terialsl as horsehair being used or any niaterial that Will serve to prevent the passage ot solid particles that are suspended in the air.

The major portion oi' the body 10, at the right or receiving side of the dustl collector 12, is the structureI of the air mixer 15.

Said air mixer 15, as shown, comprises a closed and flat bottom 1G, parallel and tlat side Walls, 17, and a top or roof 18 that is for the most part open. f l

Said root 18. vcomprises a rectangular skeleton'border or trame 19 having the opening bridged byA means of perforated sheet metal, as shown, or by vmeans of relatively tine Wire mesh 20, otherwise substantially like that that is used for the end Walls of ythe dust collector compartment 12.

In use, warm air is .admitted from the room through the screened opening 2O described.

ln order to control the relative quantity oi' Warm air from the room and cold air from outside a damper or gate 21. is provided in the air mixer 15.

As shown, said damper 21 is supported from a shaft 22 that is itseltsupported from the side walls 17, the ends of the shait projecting through said walls and being provided with Cotter-pins 23.

Actuating means tor the damper 2l. are provided mounted on the front end portion 2l ot' the shatt 22 in the forni ot the lever 25, positioned preferably in parallelism With the damper 21. Also, locking means are provided in the form ot the lockingstud 26 and nut 2.7 that are carried by the lever or crank-arm 25 and cooperate VWith a slotted y quadrant or sector 28.v A

The damper 21 is a llat-plate-like struc-V hture and may be provided With reinforcing flanges Q9 at the edges7 and as to dimensions, it lits against the sides 17 andin the closed position covers the screened opening 20.

The shaft 22 is or square torni of crosssection and the `means tor supporting the damper 2l. therefrom comprise a sleeve 3() that lits over said shaft anda radially di rested connecting piece 31 intermediate said sleeve 3() andthe rear end portion ot the damper 2l, said piece 3l serving to oompensate tor the downward oit-set position of the shaft @relatively to the top 18.

Thus notwithstanding the Jtact that` the shatQZ extends across ther-interior ot the mixing chamber lpand is located appreciahly helov,T the top 1S the damper 2l in the closed position tits snugly against the Walls ot the opening; 'that is bridged by the sereenor mesh 20.

It will be noted that the opening in the top 18 is appreciably greater in area than that in the inlettern'iinalv 11. Also, `there is of.' len'gth over the Width Ehus a relatively smallangular movement serves 'to change the damper 21 from the position ot closing'..eneopening .to Closing' the other.

The utility ot the device described is found 'for the most part duringv cold Weather, when it serves to provide .means Jfor preventing'the condensation ot moisture on` the Vconduits leading' tothe motor.

I claim as my invention:

l. An air mixer for being connected into an aircenduit system` andhaving a box-like body structure, said .bodyl structure having a relatively extended `side opening' for air in one of the lateral Walls, a plate-like dam# per housed Within said body structure? and fittingvk against the opposed inner border Walls of said opening,v a shaft extending across the interior. of said body structure and operatively supported by other otsaid lateral Walls, said shaft being spaced inwardly from said border Walls,A supporting means intermediate said shaft and damper, and said supporting means being constructed and'arrangedto compensate for the spitting` of the shaft andV damper, whereby notwithstanding Vsuch spacing the damper ivill tit flativiseagainst the border Walls ot'.

the `openinfr.` p

An air mixer comprising a box-like body structure having means at the ends for connecting into `an aireonduit, said body structure havingan opening` in the top Wall,

a damper housedI Within said 'body structure and titting over said opening, a shaft-extending through the side ivallsot saidbody structure and having-` bearings"therein, said bearings being in spaeed relation to said;`

Jfor said opening, a Ishaft supporting' said damper and having` one `end extended eut--A Wardly through one of theside Walls of said structure, a crank on said end, `and a. locking device for said crank comprising` a plate that is mounted onsaid sidewall, said plate having an arcuate slotand said crank having a locking screw that operates in said slfot and engages with the border Walls thereo .Y Y

GEORGE T. HANDLE.- 

